Oriental (A.K.A. "Turkish") tobacco...the tobacco plant/cultivar here is more or less identical to the plant which produces Izmir/Oriental; but having grown on different soils from different tobacco farmlands in the same region of Turkey each has something unique to offer. While Smyrna has a more of a musty/earthy aroma and flavor versus the slightly more "grassy" Izmir, there remains plenty of overlap between the two. Thus, while most would find one OR the other as stand alone vapes to be sufficient, those with an eye toward developing their own tobacco extract blends, will find using both only enhances depth and adds complexity.